Correct it, please.
1. - I called you yesterday, but you didn`t answer.
- Yes, yesterday I went for a walked at this time. I have been walking for an hour before sleeping bed.
2. Whenever Liz cooks, she always cooks wonderfully.
3. Will you play the guitar if I sing?
4. Metalls are melted at high temperatures.
5. Where did you buy this pen?